Datasheet

Table Of Contents
42.8.1 Control A
Name:  CTRLA
Offset:  0x00
Reset:  0x00000000
Property:  PAC Write-Protection, Enable-protected
Bit 31 30 29 28 27 26 25 24
Access
Reset
Bit 23 22 21 20 19 18 17 16
CTYPE[3:0]
Access
R/W R/W R/W R/W
Reset 0 0 0 0
Bit 15 14 13 12 11 10 9 8
XORKEY KEYGEN LOD STARTMODE CIPHER KEYSIZE[1:0]
Access
R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
CFBS[2:0] AESMODE[2:0] ENABLE SWRST
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bits 19:16 – CTYPE[3:0] Counter Measure Type
Value Name Description
XXX0
CTYPE1 disabled Countermeasure1 disabled
XXX1
CTYPE1 enabled Countermeasure1 enabled
XX0X
CTYPE2 disabled Countermeasure2 disabled
XX1X
CTYPE2 enabled Countermeasure2 enabled
X0XX
CTYPE3 disabled Countermeasure3 disabled
X1XX
CTYPE3 enabled Countermeasure3 enabled
0XXX
CTYPE4 disabled Countermeasure4 disabled
1XXX
CTYPE4 enabled Countermeasure4 enabled
Bit 14 – XORKEY XOR Key Operation
Value Description
0
No effect
1
The user keyword gets XORed with the previous keyword register content.
Bit 13 – KEYGEN Last Key Generation
Value Description
0
No effect
1
Start Computation of the last NK words of the expanded key
SAM D5x/E5x Family Data Sheet
AES – Advanced Encryption Standard
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1427